Generation of high power 121.6 nm light is vital for efficient laser cooling of antihydrogen. The nanosecond pulsed laser system developed for the ALPHA collaboration at CERN is presented here. It includes a high energy pulsed amplifier at 730 nm, followed by a doubling and subsequent gas phase third harmonic generation stage. We observe an anomalous frequency offset between the 730 nm seed laser input and the amplified light in the first stage. This leads to a frequency shift of the narrowband Lyman-alpha radiation and to a shift-dependent enhancement of the non-linear conversion process. Simulation of thermal-optical effects in the Ti:Sapphire amplifier crystals predict a similar frequency offset to experimental observation. Cavity alignment and off-resonant locking conditions introduce an additional frequency shift accompanied by an unprecedented increase in non-linear conversion to 121.6 nm radiation. The forthcoming paper will present supporting theoretical framework and simulation results of this phenomenon.
|Presenter name||Rachel Wang|
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